后台生成excel前端下载

后台生成Excel时前端获取下载

Controller控制器：

package com.example.test.controller;

import com.example.test.common.HttpRequest;
import com.example.test.utils.ExcelUtil;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.List;

@Controller
@RequestMapping(value = "/report")
public class TestController {

    public HttpRequest hr = new HttpRequest();

    /**
     * 导出Excel
     */
    @RequestMapping(value = "/excel", produces = "application/json; charset=utf-8")
    @ResponseBody
    public void findExcel(HttpServletRequest request,HttpServletResponse response) {
        String startTime = request.getParameter("startTime");
        startTime = startTime+" 00:00:00";
        String endTime = request.getParameter("endTime");
        endTime = endTime+" 00:00:00";
        String param = "startTime="+startTime+"&endTime="+endTime;
        String baseURL = "http://localhost:8080";
        String res = hr.sendPost(baseURL+"/getFinancingStat", param);

        System.out.println(res);

        List<JSONObject> list = JSONArray.fromObject(res);

        //excel标题
        String[] title = {"业务员姓名","单量","业务员电话","业务员id"};
        //excel文件名
        String fileName = "业务员数据"+startTime+"至"+endTime+".xls";
        //sheet名
        String sheetName = "业务员数据";
        String[][] content=new String[list.size()][title.length];
        for (int i = 0; i < list.size(); i++) {
            content[i] = new String[title.length];
            JSONObject obj=list.get(i);
            content[i][0] = obj.get("业务员姓名").toString();
            content[i][1] = obj.get("单量").toString();
            content[i][2] = obj.get("业务员电话").toString();
            content[i][3] = obj.get("业务员id").toString();
        }

        //创建HSSFWorkbook
        HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null);

        //响应到客户端
        try {
           this.setResponseHeader(response, fileName);
           OutputStream os = response.getOutputStream();
           wb.write(os);
           os.flush();
           os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //发送响应流方法
    public void setResponseHeader(HttpServletResponse response, String fileName) {
        try {
            try {
                fileName = new String(fileName.getBytes(),"ISO8859-1");
            } catch (UnsupportedEncodingException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            response.setContentType("application/octet-stream;charset=ISO8859-1");
            response.setHeader("Content-Disposition", "attachment;filename="+ fileName);
            response.addHeader("Pargam", "no-cache");
            response.addHeader("Cache-Control", "no-cache");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

ExcelUtil生成Excel的样式：

package com.example.test.utils;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ExcelUtil {

    /**
     * 导出Excel
     * @param sheetName sheet名称
     * @param title 标题
     * @param values 内容
     * @param wb HSSFWorkbook对象
     * @return
     */
    public static HSSFWorkbook getHSSFWorkbook(String sheetName, String []title, String [][]values, HSSFWorkbook wb){

        // 第一步，创建一个HSSFWorkbook，对应一个Excel文件
        if(wb == null){
            wb = new HSSFWorkbook();
        }

        // 第二步，在workbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(sheetName);

        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
        HSSFRow row = sheet.createRow(0);

        // 第四步，创建单元格，并设置值表头 设置表头居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式

        //声明列对象
        HSSFCell cell = null;

        //创建标题
        for(int i=0;i<title.length;i++){
            cell = row.createCell(i);
            cell.setCellValue(title[i]);
            cell.setCellStyle(style);
        }

        //创建内容
        for(int i=0;i<values.length;i++){
            row = sheet.createRow(i + 1);
            for(int j=0;j<values[i].length;j++){
                //将内容按顺序赋给对应的列对象
                row.createCell(j).setCellValue(values[i][j]);
            }
        }
        return wb;
    }
}

前端页面：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="../js/jquery.js"></script>
</head>
<body>
    开始时间：<input class="form-control" type="date" id="startTime" /><br/><br/>
    结束时间：<input class="form-control" type="date" id="endTime" /><br/><br/>
    <button id="js-export" type="button" class="btn btn-primary">导出Excel</button>
</body>
<script>
    $('#js-export').click(function(){
        var startTime = document.getElementById("startTime").value;
        var endTime = document.getElementById("endTime").value;
        window.location.href="/report/excel?startTime="+startTime+"&endTime="+endTime+"";
    });
</script>
</html>

maven中的配置：

　　　　<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.6</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-examples -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-examples</artifactId>
            <version>3.6</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-excelant -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-excelant</artifactId>
            <version>3.11</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.6</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>3.6</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.21</version>
        </dependency>
        <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <classifier>jdk15</classifier>
        </dependency>